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Winter K, Holtum JAM. Shifting photosynthesis between the fast and slow lane: Facultative CAM and water-deficit stress. JOURNAL OF PLANT PHYSIOLOGY 2024; 294:154185. [PMID: 38373389 DOI: 10.1016/j.jplph.2024.154185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/28/2023] [Accepted: 01/20/2024] [Indexed: 02/21/2024]
Abstract
Five decades ago, the first report of a shift from C3 to CAM (crassulacean acid metabolism) photosynthesis following the imposition of stress was published in this journal. The annual, Mesembryanthemum crystallinum (Aizoaceae), was shown to be a C3 plant when grown under non-saline conditions, and a CAM plant when exposed to high soil salinity. This observation of environmentally triggered CAM eventually led to the introduction of the term facultative CAM, which categorises CAM that is induced or upregulated in response to water-deficit stress and is lost or downregulated when the stress is removed. Reversibility of C3-to-CAM shifts distinguishes stress-driven facultative-CAM responses from purely ontogenetic increases of CAM activity. We briefly review how the understanding of facultative CAM has developed, evaluate the current state of knowledge, and highlight questions of continuing interest. We demonstrate that the long-lived leaves of a perennial facultative-CAM arborescent species, Clusia pratensis, can repeatedly switch between C3 and CAM in response to multiple wet-dry-wet cycles. Undoubtedly, this is a dedicated response to environment, independent of ontogeny. We highlight the potential for engineering facultative CAM into C3 crops to provide a flexible capacity for drought tolerance.
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Affiliation(s)
- Klaus Winter
- Smithsonian Tropical Research Institute, PO Box 0843-03092, Panama City, Panama.
| | - Joseph A M Holtum
- College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia
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Holtum JAM. Klaus Winter - the indefatigable CAM experimentalist. ANNALS OF BOTANY 2023; 132:563-575. [PMID: 37010384 PMCID: PMC10799999 DOI: 10.1093/aob/mcad028] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/25/2023] [Indexed: 06/19/2023]
Abstract
BACKGROUND In January 1972, Klaus Winter submitted his first paper on crassulacean acid metabolism (CAM) whilst still an undergraduate student in Darmstadt. During the subsequent half-century, he passed his Staatsexamensarbeit, obtained his Dr. rer. nat. summa cum laude and Dr. rer. nat. habil., won a Heinz Maier-Leibnitz Prize and a Heisenberg Fellowship, and has occupied positions in Germany, Australia, the USA and Panama. Now a doyen in CAM circles, and a Senior Staff Scientist at the Smithsonian Tropical Research Institute (STRI), he has published over 300 articles, of which about 44 % are about CAM. SCOPE I document Winter's career, attempting to place his CAM-related scientific output and evolution in the context of factors that have influenced him as he and his science progressed from the 1970s to the 2020s.
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Affiliation(s)
- Joseph A M Holtum
- College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia
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Variation in defensive traits against herbivores of native and invasive populations of Carpobrotus edulis. Biol Invasions 2022. [DOI: 10.1007/s10530-022-02970-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Núñez-González N, Rodríguez J, González L. Managing the invasive plant Carpobrotus edulis: is mechanical control or specialized natural enemy more effective? JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 298:113554. [PMID: 34426220 DOI: 10.1016/j.jenvman.2021.113554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 07/20/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
Carpobrotus edulis is an invasive clonal plant with drastic effects on biodiversity and functioning of coastal ecosystems. In recent years, authorities and land managers have implemented diverse management strategies that usually focus on mechanical removal and chemical control. However, applying mechanical control to remove C. edulis may cause indirect adverse effects since it could increase the probability of spreading new propagules, which do not lose their physiological activity. Therefore, reducing the physiological activity of these plant fragments should be a priority to avoid their spread and re-rooting. Our goal was to assess the plant regeneration capacity after applying mechanical control (i) when placing the plant material on different types of ground surface (on sand, on stones and using rooted plants as control) and (ii) combined with the attack of specialized herbivores (the soft scale Pulvinariella mesembryanthemi). To achieve this, we evaluated how these two factors (ground surface and herbivory) affected the plant physiological activity, its survival and re-rooting, biometric measurements, shoot and root nutrient composition and biochemical parameters (total phenols and tannins). Regardless of the ground surface type, our results indicated that the specialist herbivore greatly affected the C. edulis parameters studied. The attack of P. mesembryanthemi stimulated the plant defence mechanisms, even in those individuals with less photosynthetic activity. Furthermore, P. mesembryanthemi severely reduced the biomass and volume of plant material. Decomposition of C. edulis was accelerated by the combination between the inoculation of P. mesembryanthemi and placing the plants on the stones ground surface. Overall, preventing plant re-rooting by avoiding connection to the soil is an effective method of reducing its viability after the eighth-tenth month. After applying mechanical control, we recommend placing C. edulis fragments over an inert ground surface to avoid re-rooting, which would favour its death. We conclude that the combination of mechanical control and P. mesembryanthemi or even direct inoculation with this specialist herbivore could help authorities and land managers to improve management strategies for C. edulis.
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Affiliation(s)
- Noa Núñez-González
- Plant Ecophysiology Group, Department of Plant Biology and Soil Sciences, University of Vigo, 36310, Vigo, Spain.
| | - Jonatan Rodríguez
- Plant Ecophysiology Group, Department of Plant Biology and Soil Sciences, University of Vigo, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, 32004, Ourense, Spain; Department of Invasion Ecology, Institute of Botany of the Czech Academy of Sciences, CZ-252 43, Průhonice, Czech Republic.
| | - Luís González
- Plant Ecophysiology Group, Department of Plant Biology and Soil Sciences, University of Vigo, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, 32004, Ourense, Spain.
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Winter K. Ecophysiology of constitutive and facultative CAM photosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:6495-6508. [PMID: 30810162 DOI: 10.1093/jxb/erz002] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 01/08/2019] [Indexed: 05/24/2023]
Abstract
In plants exhibiting crassulacean acid metabolism (CAM), CAM photosynthesis almost always occurs together with C3 photosynthesis, and occasionally with C4 photosynthesis. Depending on species, ontogeny, and environment, CAM input to total carbon gain can vary from values of <1% to 100%. The wide range of CAM phenotypes between and within species is a fascinating example of functional diversity and plasticity, but poses a significant challenge when attempting to define CAM. CO2 gas exchange experiments designed for this review illustrate key patterns of CAM expression and highlight distinguishing features of constitutive and facultative CAM. Furthermore, they help to address frequently recurring questions on CAM terminology. The functional and evolutionary significance of contrasting CAM phenotypes and of intermediate states between extremes is discussed. Results from a study on nocturnal malate accumulation in 50 species of Aizoaceae exposed to drought and salinity stress suggest that facultative CAM is more widespread amongst vascular plants than previously thought.
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Affiliation(s)
- Klaus Winter
- Smithsonian Tropical Research Institute, Balboa, Ancón, Republic of Panama
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Campoy JG, Roiloa SR, Santiso X, Retuerto R. Ecophysiological differentiation between two invasive species of Carpobrotus competing under different nutrient conditions. AMERICAN JOURNAL OF BOTANY 2019; 106:1454-1465. [PMID: 31658373 DOI: 10.1002/ajb2.1382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Accepted: 09/13/2019] [Indexed: 06/10/2023]
Abstract
PREMISE Hybridization between the South African invasive species Carpobrotus edulis and C. acinaciformis in Europe has led to the formation of highly aggressive morphotypes referred to in the scientific literature as the new large "hybrid swarm" C. aff. acinaciformis. In the present study, we aimed to determine whether the taxonomic differentiation between taxa coincides with ecophysiological differentiation. With this aim, we tested for differences between both morphotypes in functional traits related to competitive ability and resource-use efficiency. Assuming that the complex hybrid C. aff. acinaciformis is more vigorous, depends more strongly on vegetative reproduction, and invests less in sexual reproduction than C. edulis, we predicted that the hybrid would show higher competitive ability and better physiological performance compared with the species. METHODS We used a comparative ecophysiological approach to assess the extent to which two Carpobrotus morphotypes coexisting in northwestern Spain differ in physiological, reproductive, and growth traits when competing under different soil nutrients in controlled greenhouse conditions. RESULTS C. aff. acinaciformis had a greater relative growth rate and water-use and photochemical efficiencies compared to C. edulis. However, C. edulis appeared to be more responsive to incremental change in soil nutrients than C. aff. acinaciformis. They also differed in the amount of resources invested in reproduction. CONCLUSIONS The study findings demonstrate that the taxonomic differentiation between taxa corresponds to ecophysiological differentiation, warranting a detailed examination of all existing trades-offs to predict the long-term outcomes of the interaction between these taxa.
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Affiliation(s)
- Josefina G Campoy
- Department of Functional Biology, Area of Ecology, Faculty of Biology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Sergio R Roiloa
- BioCost Group, Department of Biology, Faculty of Science, Universidade da Coruña, A Coruña, Spain
| | - Xabier Santiso
- Department of Functional Biology, Area of Ecology, Faculty of Biology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Rubén Retuerto
- Department of Functional Biology, Area of Ecology, Faculty of Biology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Herbivore accumulation on invasive alien plants increases the distribution range of generalist herbivorous insects and supports proliferation of non-native insect pests. Biol Invasions 2019. [DOI: 10.1007/s10530-019-01913-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Fenollosa E, Munné-Bosch S, Pintó-Marijuan M. Contrasting phenotypic plasticity in the photoprotective strategies of the invasive species Carpobrotus edulis and the coexisting native species Crithmum maritimum. PHYSIOLOGIA PLANTARUM 2017; 160:185-200. [PMID: 28058723 DOI: 10.1111/ppl.12542] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/17/2016] [Accepted: 01/03/2017] [Indexed: 06/06/2023]
Abstract
Photoprotective strategies vary greatly within the plant kingdom and reflect a plant's physiological status and capacity to cope with environment variations. The plasticity and intensity of these responses may determine plant success. Invasive species are reported to show increased vigor to displace native species. Describing the mechanisms that confer such vigor is essential to understanding the success of invasive species. We performed an experiment whereby two species were monitored: Carpobrotus edulis, an aggressive invasive species in the Mediterranean basin, and Crithmum maritimum, a coexisting native species in the Cap de Creus Natural Park (NE Spain). We analyzed their photoprotective responses to seasonal environmental dynamics by comparing the capacity of the invader to respond to the local environmental stresses throughout the year. Our study analyses ecophysiological markers and photoprotective strategies to gain an insight into the success of invaders. We found that both species showed completely different but effective photoprotective strategies: in summer, C. edulis took special advantage of the xanthophyll cycle, whereas the success of C. maritimum in summer stemmed from morphological changes and alterations on β-carotene content. Winter also presented differences between the species, as the native showed reduced Fv /Fm ratios. Our experimental design allowed us to introduce a new approach to compare phenotypic plasticity: the integrated phenotypic plasticity index (PPint ), defined as the maximum Euclidian distance between phenotypes, using a combination of different variables to describe them. This index revealed significantly greater phenotypic plasticity in the invasive species compared to the native species.
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Affiliation(s)
- Erola Fenollosa
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Sergi Munné-Bosch
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Marta Pintó-Marijuan
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
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Winter K, Holtum JAM. Facultative crassulacean acid metabolism (CAM) plants: powerful tools for unravelling the functional elements of CAM photosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:3425-41. [PMID: 24642847 DOI: 10.1093/jxb/eru063] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Facultative crassulacean acid metabolism (CAM) describes the optional use of CAM photosynthesis, typically under conditions of drought stress, in plants that otherwise employ C3 or C4 photosynthesis. In its cleanest form, the upregulation of CAM is fully reversible upon removal of stress. Reversibility distinguishes facultative CAM from ontogenetically programmed unidirectional C3-to-CAM shifts inherent in constitutive CAM plants. Using mainly measurements of 24h CO2 exchange, defining features of facultative CAM are highlighted in five terrestrial species, Clusia pratensis, Calandrinia polyandra, Mesembryanthemum crystallinum, Portulaca oleracea and Talinum triangulare. For these, we provide detailed chronologies of the shifts between photosynthetic modes and comment on their usefulness as experimental systems. Photosynthetic flexibility is also reviewed in an aquatic CAM plant, Isoetes howellii. Through comparisons of C3 and CAM states in facultative CAM species, many fundamental biochemical principles of the CAM pathway have been uncovered. Facultative CAM species will be of even greater relevance now that new sequencing technologies facilitate the mapping of genomes and tracking of the expression patterns of multiple genes. These technologies and facultative CAM systems, when joined, are expected to contribute in a major way towards our goal of understanding the essence of CAM.
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Affiliation(s)
- Klaus Winter
- Smithsonian Tropical Research Institute, PO Box 0843-03092, Balboa, Ancon, Republic of Panama
| | - Joseph A M Holtum
- Smithsonian Tropical Research Institute, PO Box 0843-03092, Balboa, Ancon, Republic of Panama School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia
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Herrera A. Crassulacean acid metabolism and fitness under water deficit stress: if not for carbon gain, what is facultative CAM good for? ANNALS OF BOTANY 2009; 103:645-53. [PMID: 18708641 PMCID: PMC2707347 DOI: 10.1093/aob/mcn145] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2008] [Revised: 04/18/2008] [Accepted: 06/24/2008] [Indexed: 05/25/2023]
Abstract
BACKGROUND In obligate Crassulacean acid metabolism (CAM), up to 99 % of CO(2) assimilation occurs during the night, therefore supporting the hypothesis that CAM is adaptive because it allows CO(2) fixation during the part of the day with lower evaporative demand, making life in water-limited environments possible. By comparison, in facultative CAM (inducible CAM, C(3)-CAM) and CAM-cycling plants drought-induced dark CO(2) fixation may only be, with few exceptions, a small proportion of C(3) CO(2) assimilation in watered plants and occur during a few days. From the viewpoint of survival the adaptive advantages, i.e. increased fitness, of facultative CAM and CAM-cycling are not obvious. Therefore, it is hypothesized that, if it is to increase fitness, CAM must aid in reproduction. Scope An examination of published reports of 23 facultative CAM and CAM-cycling species finds that, in 19 species, drought-induced dark CO(2) fixation represents on average 11 % of C(3) CO(2) assimilation of watered plants. Evidence is discussed on the impact of the operation of CAM in facultative and CAM-cycling plants on their survival--carbon balance, water conservation, water absorption, photo-protection of the photosynthetic apparatus--and reproductive effort. It is concluded that in some species, but not all, facultative and cycling CAM contribute, rather than to increase carbon balance, to increase water-use efficiency, water absorption, prevention of photoinhibition and reproductive output.
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Affiliation(s)
- Ana Herrera
- Instituto de Biología Experimental, Universidad Central de Venezuela, Calle Supure, Colinas de Bello Monte, Caracas, Venezuela.
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Lüttge U. CARBON DIOXIDE AND WATER DEMAND: CRASSULACEAN ACID METABOLISM (CAM), A VERSATILE ECOLOGICAL ADAPTATION EXEMPLIFYING THE NEED FOR INTEGRATION IN ECOPHYSIOLOGICAL WORK. THE NEW PHYTOLOGIST 1987; 106:593-629. [PMID: 33874076 DOI: 10.1111/j.1469-8137.1987.tb00163.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Plants having crassulacean acid metabolism (CAM) tend to occupy habitats where the prevailing environmental stress is scarcity of water. These are semi-arid or arid regions, salinas or epiphytic sites. CAM plants manage the dilemma of desiccation or starvation by nocturnal malic acid accumulation in the vacuoles. Malic acid serves as a form of CO2 storage and as an osmoticum. In this way malic acid accumulation allows, firstly, separation of uptake and assimilation of atmospheric CO2 with water-saving daytime stomatal closure and, secondly, osmotic acquisition of water. There is no very special trait which is specific for CAM. An array of biophysical and biochemical functional elements, which are also found in other plants, is integrated in CAM performance. This leads to a large diversity of behaviour which makes CAM plants highly versatile in their response to environmental variables. Besides CO2 dark fixation, transport of malic acid across the tonoplast is one of the key elements in CAM function. This is examined in detail at the level of membrane biophysics and biochemistry. The versatility of CAM is illustrated by examples from field work, with comparisons involving different species, seasons, modes of photosynthesis (CAM vs C3 ), kinds of stress and ways of stress imposition. Contents Summary 593 I. Studies of CAM: an example for the ecophysiological approach 594 II. Malic acid transport at the tonoplast 602 III. Regulation 605 IV. Desiccation or starvation 610 V. Comparative autecology 614 VI. Ecology: promise of integration 621 Acknowledgements 622 References 622.
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Affiliation(s)
- U Lüttge
- Institut fuUr Botanik, Technische Hochschule Darmstadt, D-6100 Darmstadt, FRG
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Earnshaw MJ, Carver KA, Charlton WA. Leaf anatomy, water relations and crassulacean acid metabolism in the chlorenchyma and colourless internal water-storage tissue of Carpobrotus edulis and Senecio ?mandraliscae. PLANTA 1987; 170:421-432. [PMID: 24232974 DOI: 10.1007/bf00395036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/1986] [Accepted: 11/06/1986] [Indexed: 06/02/2023]
Abstract
Both Carpobrotus edulis and Senecio ?mandraliscae possess leaves with a peripheral chlorenchyma and colourless internal water-storage tissue. Water stress in C. edulis growing under semi-natural conditions resulted in the induction of weak Crassulacean acid metabolism (CAM) whereas well-watered plants of S. ?mandraliscae exhibited a similar degree of CAM. Titratable acidity in the separated water-storage tissue was substantially lower than in the chlorenchyma in both species but, nevertheless, increased during the night and decreased during the day either when sampled from the intact plant or from incubated tissue slices. Indeed, the increase in nocturnal titratable acidity produced by the water-storage tissue in situ accounted for approx. 30% of total acidification on a per-leaf basis. It appears that during the night the water-storage tissue in these species is able to fix CO2 which is subsequently released during the day to enter the photosynthetic carbon-reduction cycle of the chlorenchyma. Diurnal rhythms of water potential (Ψ) and osmotic potential (Ψs) were measured in separated chlorenchyma and water-storage tissue by thermocouple psychrometry. Both parameters increased during the latter part of the daytime and initial nocturnal period and decreased during the rest of the night and into the post-dawn period. The chlorenchyma of water-stressed plants of C. edulis appeared to possess a marked negative turgor pressure (as determined from Ψ-Ψs) but this was caused by a severe underestimation in the measurement of the chlorenchyma Ψ. It is suggested that this artefact arose from release of colloidal polysaccharide mucilage, or possibly tannins, from broken tannin cells producing a lowering of water activity when measured using thermocouple psychrometry.
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Affiliation(s)
- M J Earnshaw
- Department of Cell and Structural Biology, University of Manchester, Williamson Building, M13 9PL, Manchester, UK
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Seasonal patterns of CO2 and water vapor exchange of three salt marsh succulents. Oecologia 1979; 43:249-260. [DOI: 10.1007/bf00344952] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/1978] [Indexed: 10/26/2022]
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Carbon Assimilation Pathways in Mesembryanthemum nodiflorum L. under Natural Conditions. ACTA ACUST UNITED AC 1978. [DOI: 10.1016/s0044-328x(78)80083-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Salema R, Brandão I. Development of microtubules in chloroplasts of two halophytes forced to follow Crassulacean acid metabolism. JOURNAL OF ULTRASTRUCTURE RESEARCH 1978; 62:132-6. [PMID: 650730 DOI: 10.1016/s0022-5320(78)90026-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Mineral Ion composition and occurrence of CAM-like diurnal malate fluctuations in plants of coastal and desert habitats of israel and the Sinai. Oecologia 1976; 25:125-143. [DOI: 10.1007/bf00368849] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/1976] [Indexed: 10/26/2022]
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Downton WS, Törökfalvy E. Effect of Sodium Chloride on the Photosynthesis of Aeluropus litoralis, a Halophytic Grass. ACTA ACUST UNITED AC 1975. [DOI: 10.1016/s0044-328x(75)80110-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Treichel S. Crassulaceensäurestoffwechsel bei einem salztoleranten vertreter der aizoaceae: Aptenia cordifolia. ACTA ACUST UNITED AC 1975. [DOI: 10.1016/0304-4211(75)90086-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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22
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Jones MB. The effect of leaf age on leaf resistance and CO2 exchange of the CAM plant Bryophyllum fedtschenkoi. PLANTA 1975; 123:91-6. [PMID: 24436027 DOI: 10.1007/bf00388063] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/1974] [Accepted: 12/19/1974] [Indexed: 05/16/2023]
Abstract
Leaves of different ages from the CAM (Crassulacean acid metabolism) plant Bryophyllum fedtschenkoi Hamet et Per. differ in their ability to accumulate titratable actidity during the night. Measurements of leaf resistance to water vapour diffusion and net CO2 exchange during the day and night show differing patterns of behaviour dependent upon leaf age. Young leaves do not exhibit CAM; they behave like typical mesophytes with low resistances and a net uptake of CO2 during the day and a net output of CO2 at night. Mature leaves exhibit CAM and have high leaf resistances during the day and lower resistances at night but their pattern of CO2 exchange is complex, with a net output early in their day followed by a net uptake which continues at a reduced rate through the night. Intermediate, leaves are intermediate in their behaviour The presence of CAM in older leaves may simply be the result of increased cell vacuole size.Leaf resistance measurements are discussed in relation to the possible control of stomatal opening by substomatal CO2 concentrations.
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Affiliation(s)
- M B Jones
- Department of Biological Sciences, University of Lancaster, UK
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Cockburn W. Crassulacean acid metabolism in Lithops insularis; a non-halophytic member of the Mesembryanthemaceae. PLANTA 1974; 118:89-90. [PMID: 24442202 DOI: 10.1007/bf00390506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/1974] [Indexed: 06/03/2023]
Abstract
Lithops insularis, a non-halophytic member of the Mesembryanthemaceae, is shown to exhibit major features if crassulacean acid metabolism. Data are presented which demonstrate the accumulation, by this plant, of malic acid synthesised in darkness from carbon dioxide.
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Affiliation(s)
- W Cockburn
- Botanical Laboratories, University of Leicester, LE1 7RH, Leicester, UK
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24
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Unterschiedliche NaCl-Abh�ngigkeit des tagesperiodischen CO2-Gaswechsels bei einigen halisch wachsenden K�stenpflanzen. Oecologia 1974; 17:87-95. [DOI: 10.1007/bf00345097] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/1974] [Indexed: 11/27/2022]
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25
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26
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Wachstum und photosyntheseleistung der halophyten Mesembryanthemum nodiflorum L. und Suaeda maritima (L.) Dum. bei variierter NaCl-Salinit�t des anzuchtmediums. Oecologia 1974; 17:317-324. [DOI: 10.1007/bf00345749] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/1974] [Indexed: 10/26/2022]
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